问题
I have the following xml:
<?xml version="1.0"?>
<catalog>
<book id="bk101">
<author>Gambardella, Matthew</author>
<title>XML Developer's Guide</title>
<genre>Computer</genre>
<price>44.95</price>
<publish_date>2000-10-01</publish_date>
<description>An in-depth look at creating applications
with XML.</description>
</book>
<book id="bk102">
<author>Ralls, Kim</author>
<title>Midnight Rain</title>
<genre>Fantasy</genre>
<price>5.95</price>
<publish_date>2000-12-16</publish_date>
<description>A former architect battles corporate zombies,
an evil sorceress, and her own childhood to become queen
of the world.</description>
</book>
</catalog>
I found the title named "Midnight Rain". Now i want to know who is his parent so that i can use the <author>
text node. I tried something like:
var xpath = "../*[local-name() != 'title']";
xml.Load(xmlalltext);
var xl1 = xml.SelectNodes(xpath);
MessageBox.Show(xl1.Item(0).InnerText.ToString());
回答1:
If you've already found the title node and you're looking for the parent node, you can just select the parent node of the current node.
var parentNode = titleNode.SelectSingleNode("..");
If you're looking for the author node:
var authorNode = titleNode.SelectSingleNode("../author");
Alternatively, you may look for preceding or following siblings:
var authorNode = titleNode.SelectSingleNode("following-sibling::author") ?? titleNode.SelectSingleNode("preceding-sibling::author");
Edit: To answer your comment, if you only have the string of the title, then you may use the following to get the author:
string xml = @"xml...";
var doc = XDocument.Parse(xml);
string author = doc
.Descendants("book")
.Where(x => x.Element("title").Value == "Midnight Rain")
.Select(x => x.Element("author").Value)
.FirstOrDefault();
回答2:
using XLinq
sample.xml(in below snipped) contains xml data
XElement root = XElement.Parse(File.ReadAllText("sample.xml"));
var matchingBooks = root.Descendants().Where(i=>String.Equals(i.Value,"Midnight Rain")).Select(i=>i.Parent) ;
var authors = matchingBooks.Elements("author");
Output in LinqPad
matchingBooks.Dump();
authors.Dump();
<book id="bk102">
<author>Ralls, Kim</author>
<title>Midnight Rain</title>
<genre>Fantasy</genre>
<price>5.95</price>
<publish_date>2000-12-16</publish_date>
<description>A former architect battles corporate zombies,
an evil sorceress, and her own childhood to become queen
of the world.</description>
</book>
<author>Ralls, Kim</author>
回答3:
You can use this xpath expession to get author node
"/catalog/book[title='Midnight Rain']/author"
or this to get parent node
"/catalog/book[title='Midnight Rain']"
eg.
var result = xml.SelectNodes(string.Format("/catalog/book[title='{0}']/author", "Midnight Rain"))
来源:https://stackoverflow.com/questions/10580607/how-can-i-get-the-parent-of-node-text-value-in-c